package com.zc58s.mymap;

import java.util.HashMap;

/**
 * @author : fujc-dev@qq.com
 */

public class TestMap extends HashMap<String,String> {
    private static final long serialVersionUID = -7997633436873364626L;

    @Override
    public String put(String key, String value) {
        return super.put(key.toUpperCase(), value);
    }
}
